ser2net: add license information

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/ser2net/ser2net.mk

@@ -7,5 +7,7 @@
 SER2NET_VERSION = 2.7
 SER2NET_SOURCE = ser2net-$(SER2NET_VERSION).tar.gz
 SER2NET_SITE = http://downloads.sourceforge.net/project/ser2net/ser2net/$(SER2NET_VERSION)
+SER2NET_LICENSE = GPLv2+
+SER2NET_LICENSE_FILES = COPYING
 
 $(eval $(autotools-package))